Humans spend approximately one-third of their lives sleeping, more time than is spent on any other single activity. Everyone needs sleep, and everyone loves that feeling of lying down and closing his or her eyes at the end of the day. But despite the fact that sleep...

How long can you survive without sleep? Right now, there is not a definitive answer. In most sleep-deprivation cases, humans’ bodies inevitably put themselves to sleep. They fall into short “microsleeps,” a brief period (around 30 seconds) in which an individual...